It's funny, because I started to play Spelunky again after a long absence, which is arguably one of the hardest games to master on your own. I'm not particularly good, played for about 28 hours and have not yet finished the game. (I rarely reach the ice caves...)
The thing with this game is: It needs a lot of awareness, patience and you need to know all different kinds of game mechanics. It's not terribly complicated, but uncovering everything by yourself is madness. I was so frustrated that I started to watch videos and was enlightened by some of the tactics (yeah, around the shopkeeper...)
So the blog post has some correct points: To improve, you need to inform yourself and maybe try to get feedback. But is it fun? Is it fun to read everything about the game, potentially spoiling it, simply to own? I'm not sure. I believe you can have a lot of fun without being the best for quite some time, but I have to admit that there's a point, where it starts to hurt your ego..
So then you start to read everything about it and then what? I think, there are personal and environmental limits, which learning cannot fix. You cannot simply fix the patience you need to play the same level again and again just to improve. In FPS games, you cannot get to the 95% without investing in your hardware. And you simply cannot compete with people having too much time on their hand, while you juggle your job, family and household.
The thing is, maybe going for the 95%-tile is futile? But who cares? Simply enjoy to be average. Support your teammates as good as you can. Have fun walking into that spike trap for the 100th time. Don't take everything too serious.